Heat oven to
350F (175C). Grease a 9-inch (23-cm) square cake pan. Combine shortening
and chocolate in a small saucepan and set over lowest heat to melt.
Combine sugar, egg and chocolate mixture in mixing bowl and beat well.
Sift flour, baking soda and salt together and add to sugar mixture
alternately with mixture of buttermilk or soured milk and vanilla. Pour
into prepared pan and bake about 35 minutes or until top springs back when
touched lightly in center. Cool in pan. Ice with
Creamy Chocolate Icing.